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Francium-223 is the most stable isotope, with a half-life of 21.8 minutes, [8] and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized. [22] Francium-223 is a fifth product of the uranium-235 decay series as a daughter isotope of actinium-227; thorium-227 is the more common daughter. [23]
Perey named the element francium, after her home country, and it joined the other alkali metals in Group 1 of the periodic table of elements. [3] [7] Francium is the second rarest element (after astatine) — only about 550g exists in the entire Earth's crust at any given time — and it was the last element to be discovered in nature.
The Solana Generating Station is a solar power plant near Gila Bend, Arizona, about 70 miles (110 km) southwest of Phoenix. It was completed in 2013. It was completed in 2013. When commissioned, it was the largest parabolic trough plant in the world, and the first U.S. solar plant with molten salt thermal energy storage . [ 3 ]
Valerie Jean Solanas (April 9, 1936 – April 25, 1988) was an American radical feminist known for the SCUM Manifesto, which she self-published in 1967, and her attempt to murder the artist Andy Warhol in 1968.
Francium (87 Fr) has no stable isotopes, thus a standard atomic weight cannot be given. Its most stable isotope is 223 Fr with a half-life of 22 minutes, occurring in trace quantities in nature as an intermediate decay product of 235 U. Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable.
Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. [8] It was the last element discovered in nature, rather than by synthesis. [note 2] Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and ...
Fruits including tomatoes, tomatillos, eggplant/aubergine, bell peppers and chili peppers, all of which are closely related members of the Solanaceae.. The Solanaceae (/ ˌ s ɒ l ə ˈ n eɪ s i. iː,-ˌ aɪ /), [3] or the nightshades, is a family of flowering plants that ranges from annual and perennial herbs to vines, lianas, epiphytes, shrubs, and trees, and includes a number of ...
The claim that francium has a lower electronegativity than caesium is widely, though not universally, repeated: this would be expected on the basis of periodicity, but measurements show that the ionization energy of francium is higher (4.0712 eV; Andreev, S.V.; Letokhov, V.S.; Mishin, V.I., Laser resonance photoionization spectroscopy of ...